Then build trams, bike lanes and bus lanes in el alto and la paz. Just because its not possible one place In the city, doesn't mean they can't be done in other parts.
E-bikes are a great way to get around hilly cities.
The cable cars leave long gaps between stations so some more local transit would be beneficial.
As for transport in Canada stick to the conventional methods, they are conventional methods because they work.
I was talking about public transit for Toronto
The conversation has prompted me to have a tour on Google maps. First I explored round universidad pública de el alto. It's surrounded bu 2 lane boulevards and a motorway. Lots of the roads looked pretty empty once you were away from the main roads. Though the street view is now 10 years old in that area. There is plenty of space for protected bike lanes on these roads.
I also looked as places in La Paz itself and while it is steeper it looks comparable to Lisbon, which has lots of trams and metros. On places where it is really to steep for conventional trams. Bus lanes or more specialised options like cable hauled or rack and pinion are used, but are rarer.
I do have to say, what a beautiful city. Overall, some roads may be too steep for trams however many are suitable. A road being busy isn't a reason to not build. One tram can cary over 100 people, by getting people from cars into trams it reduces traffic, even if one lane is used for a dedicated bus and tram lane (which can also be used by police, fire and ambulance). This leaves the remaining lane for people who need to drive, rather than those who drive because they have no choice.
That's still less than a bike lane and a the low end of a bus lane. If the space is avaliable for a cable car. An elevated metro (or Brussels style pre-metro) would be a better solution in my opinion.
If we take that assumption that is 20 people a minute, or 1200 people an hour. About as much as if everyone just drove in their cars.
They lack the capacity to be usefull unfortunately. A tram, bus lane, train/metro or bike lane would do the job better.
Public transit should be frequent, especially in a city of 2 million people. Waits should be no more than 10 mins to change lines. The trams may be slower for an individual however they are faster for everyone as it pulls people out of cars. A capacity of only 4000 people per hour is basically nothing in a city of that size.